| 摘要 |
PURPOSE: To improve cleavage without exposing a tear line to external appearance by respectively putting an angle of both side groove walls to form a part up to a midway part of a first slit of a module cover, an angle up to a midway part of a second slit continuing with the first slit by changing the direction and an angle up to final cleavage from a midway part in the specific relationship. CONSTITUTION: A first slit 43 is formed on the reverse side of a module cover 4, and a second slit 44 in the direction perpendicular to the first slit 43 is formed on its tail end P2 , and an H-shaped rupture line is formed. An angle α of both side groove walls to form a part up to a midway part of the first slit from a cleavage initial part P1 of the first slit 43, an angle β of both side groove walls to form a part up to a midway part of the second slit 44 from there and an angle γ of both side groove walls to form a part up to final cleavage P3 from there are respectively made constant, and are put in the relationship of (α<β<γ). As a result, A part up to a midway part of the first slit 43 becomes the acutest angle, and stress is easily received, and the stress is received in order, and cleavage is easily propagated to the second slit 44 from the first slit 43. |
